yeah so the file belongs to the root user.. not you, meaning you have to use sudo or chown
root
sudo
chown
Just use
echo 'document.addEventListener("DOMContentLoaded", function() {$.ajax({url: "https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css",success: function(css) {let overrides = "code { background-color: #535353; color: #85c5ff; } .c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353 !important; background-color: #535353 !important; }"; $("<style></style>").appendTo("head").html(css + overrides);}});});' | sudo tee -a /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js
to fix your permission issues.
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yeah so the file belongs to the
rootuser.. not you, meaning you have to usesudoorchownJust use
to fix your permission issues.